The x300u-a is an enhanced version of surefire&';s best-selling x300 ultra but delivers 1000 lumens of led-generated output focused by a precision tir lens, creating a far-reaching high intensity beam.This intense beam also provides extensive peripheral illumination for maintaining situational awareness.Activating is done via switching located at the rear of body, providing one-finger control press the switch on either side for momentary-on activation, flip up or down for constant-on activation.Optional dg grip switches (for pistols) and a pressure activated xt07 tape switch (for long guns) permit the x300 ultra to be activated without altering your grip on your weapon.It can be attached to a pistol or a long gun since its rail-lock system which permits rapid attachment to and removal from either universal or picatinny rails. FEATURES Recoil-proof high-performance LED produces 1,000 lumens Custom TIR lens creates smooth, far-reaching light with a larger center spot beam that is ideal for close- to medium-range engagements Integral ambidextrous momentary- and constant-on switching provides easy instant activation Attaches securely to both Universal and Picatinny accessory rails IPX7 waterproof to 1 meter for 30 minutes High-strength aerospace aluminum body is Mil-Spec hard anodized for extreme durability Accepts optional pressure-activated DG and XT remote switches for precision control without altering grip on weapon